ProgramNode(0...6)(
  [],
  StatementsNode(0...6)(
    [HashNode(0...6)(
       (0...1),
       [AssocNode(2...4)(
          SymbolNode(2...4)(nil, (2...3), (3...4), "y"),
          nil,
          nil
        )],
       (5...6)
     )]
  )
)
